Heterogeneous Mn-Ni(OH)2/NiO@C hierarchical porous nanosheets for high energy density hybrid supercapacitors

Multicomponent heterogeneous nanomaterials generally have the potential to exhibit excellent electrochemical performance. Herein, Mn-doped Ni(OH) 2 , NiO and C heterogeneous composites are designed and synthesized by using metal-organic frameworks (MOFs) as self-sacrificial templates. The synergistic effect brought by the multicomponent heterogeneous composition effectively improves the charge storage capacity, the two-dimensional nanosheet structure provides a large specific surface area, and the graphitic carbon enhances the electrical conductivity. The Mn-Ni(OH) 2 /NiO@C composite as an electrode material exhibits a specific capacity of 732.1 C g −1 at 1 A g −1 . Furthermore, the assembled Mn-Ni(OH) 2 /NiO@C//AC HSC device can output 38.0 Wh kg −1 at a power density of 849.2 W Kg −1 , with 82.9% retention after 5000 cycles. This study provides a novel strategy for MOFs as templates to obtain multicomponent energy storage materials. • Mn-Ni(OH) 2 /NiO@C heterogeneous composites obtained by Ni-MOF as self-sacrificial template. • Mn-Ni(OH) 2 /NiO@C heterogeneous composites exhibits a unique porous nanosheet structure. • The Mn-Ni(OH) 2 /NiO@C electrode possess high specific capacity. • The assembled Mn-Ni(OH) 2 /NiO@C//AC hybrid supercapacitor exhibit excellent electrochemical performance.